#top{
	width: 700px;
	height: 153px;
	background-color: red;
}
#top-a{
	width: 700px;
	height: 120px;
	background-image: url(../img/banner.jpg);
}
#top-b ul li{
	list-style: none;
	float: left;
	width: 100px;
	line-height: 33px;
	text-align: center;
	background-image: url(../img/button1.jpg);
}
#top-b ul li:hover{
	background-image: url(../img/button1_bg.jpg);
	position: relative;
}